Forced air wall heater



P. D. KILBURY FORCED MR WALL HEATER Filed March 22, 1954 May 21, 1957 a 4M 4 u M W6 United States Patent C FORCED AIR WALL HEATER Paul D. Kilbury, Hawthorne, Calif. Application March 22, 1954, Serial No. 417,630 2 Claims. (Cl. 126-110) The present invention relates generally to space heaters, and is more particularly concerned with space heaters of the forced air type which are adapted for mounting in; the wall of a room or building.

One object of the herein described invention is to provide a wall heater in which a portion of the air is supplied to a heating chamber by means of a blower, while a portion of the air which is supplied to the heating chamber is provided for by inducing additional air flow at the blower discharge by the action of the air discharge from the blower. In this Way, load on the motor driving the blower is reduced and more quiet operation is obtained.

Another object of the invention is to provide ina wall heater a casing and heating chamber having outer walls in spaced relation was to provide an air passage through which air is circulated during operation of the heater. The casing of the heater is thus maintained cool during operation, and the plaster and wall structure may be carried into contact relation with the casing.

Fuither objects of the invention will be brought out in the following part of the specification, wherein detailed description is for the purpose of fully disclosing the invention without placing limitations thereon.

Referring to the accompanying drawings, which are for illustrative purposes only:

Fig. l is a front elevational view of a wall heater embodying the features of the herein described invention, portions being cut away and shown in section to disclose the operative relationship of certain of the heater parts;

Fig. 2 is a vertical section through the heater of Fig. 1, taken substantially on line 22 of Fig. l; and a Fig. 3 is an enlarged detailed sectional view at the blower outlet, taken substantially on line 3-3 of Fig. 1.

Referring more specifically to the drawings, the wall heater of the present invention is enclosed within a rectangular upright casing in which a forward wall 11 is provided with an upper or top opening 12 and a lower or bottom opening 13. The opening 12 is shown as being covered with a conventional grille 14, while the bottom opening is covered with a grille 15. These grilles may be of conventional construction and are shown as being arranged with peripheral edge portions to facilitate securement in operative position and ready removal when required to permit access to various parts of the heater. The casing is constructed with a back wall 16 which is connected with the front wall 11 by side walls 17 and 18.

Within the casing 10, there is further provided a box like structure having a forward wall 19, a back wall 20, and side walls 21 and 22 which cooperate to forma heating chamber 23. It will be observed that the associated walls of the casing and the box like structure are in spaced relation so as to form an air flow passage therebetween for cooling purposes and to maintain the casing wall in a cool condition during heater operation. With such cooling, the wall and plaster structure of the room or building may be carried up to and directly into contact with the heater casing.

2,792,826 Patented May 21, 1957 The lowermost end of the heating chamber 23 is closed by a wall member 24 which acts as a partition to separate the casing into an upper compartment containing the heating chamber, and a lower compartment 25. The heating chamber communicates through an opening-26 in its front wall with a portion of the casing opening 13, while the lower compartment 25 communicates through an opening 27 with another portion of thecasing opening 13 Moreover, as shown in Fig. 2, a filler guide plate 28 is mounted in the lower corner angle formed by the back wall 20' and partition 24 so as to provide a more uniform flow path for air from the heating chamber to tangular construction, this plate being supported in spaced relation by spacer elements 32 and secured by bolts 33 at its corners.

The plate 31 has a blower 34 mounted thereon, the blower having a casing scroll 35 with its outlet neck 36 connected to the plate 31 andarranged to discharge air through an appropriate opening in the plate. Intake air enters the blower casing through an opening 37 positioned on the opposite side of the casing from a blower driving motor 38. With the blower thus arranged, intake air is drawn in through the grille 14 and discharged into the heating chamber where its entrance is distributed by means of deflectors 39, 40 and 41.

Movement of the air discharge from the blower 34, as it passes through the space below plate 31. and into opening 30, acts to induce an additional flow of air to the extent of 30% to 40% into the heating chamber. The load on the blower is thus relieved, with the result that the blower operates more quietly than if all the air were taken through the blower.

A main duct passage, as indicated by the numeral 42, is provided for conducting hot gases of combustion through the heating chamber 23 into heat exchange relation with the air forced therethrough by the action of the blower 34.

The main duct passage includesa relatively fiat boxlike walled hollow structure of substantially rectangular configuration, which forms a combustion chamber 43. This combustion chamber is positioned adjacent the forward wall 19 of the heating chamber 23, and at its lowermost end is connected through a plurality of tubular inlet ducts 43 in spaced apart relation, these ducts having their lowermost ends anchored in the wall member 24 and in communication with the lower compartment 25.

At the uppermost end of the combustion chamber, a. plurality of outlets 44 are arranged to conduct the hot gases of combustion from the combustion chamber 43 into a radiator 45 of hollow construction, this radiator being supported on the rear side of the combustion chamber and having walls of similar construction to that of the combustion chamber in that these walls may be fluted or otherwise fabricated to increase the heat transfer therethrough.

partition 46 to the end that the gases of combustion will initially move through a pass 47 in a downward direction to the bottom of the radiator and thence in an upward direction through a pass 48 to an outlet connection 49 at the top of the heating chamber 23.

It is a feature of the invention to mount a fuel burner 50 directly within the combustion chamber. The burner 50 comprises generally an elongate body portion 51 which carries on its upper surface a plurality of burner nozzles 52, these nozzles being fed with fuel, in this case a gas, through a venturi supply tube 53 of reverse channel construction, and formed at its entrance end with an inlet 54 ar a-nae o p imar a r- A p pe con ectio .5 slashes. as. inc to the burner for mixing with the primary air in the venturi which acts to provide a thoroughly mixed combustible m tu n un f rm el t o he zles 5 By placing the fuel burner 5Q directly in the combustion chamber, air for combustion provides the secondary air supply. The air for combustion enters the inlet ducts 43, and since these ducts are in-the path of flow-of heated a discharged om e. ea in cham e ro g t e upperportion of the grille 15, it will be apparent thatthe nt a w l e n a l h e eat d n ts flow t e burnenthus increasing; the efficiency of the heater v The, i o omb s o s. shpn e to th n etdncts. 435 fr m. t e lower c p t n .5, t ea r ent r n s co rad ment t o t e l we yphr o hf he ll .15

A flue connection 55 is provided at the, upper;- end of the. a ng. 0- Th s fin o hec na t its; nnermost: end com ica w th a v nt. di erter f.- onventi nal struction, and shown as comprising a box:- 56; having a longitudinally extending upstanding partition 5.7. thfilieim Th ne t t epar t s th x nto ompar mentsss. and; 59 which are interconnected at their upper ends through. aware or openin v a ov t e partition. 57.

The lower end of the compartment- 58 is provided. with. a nipple. 61 which connects with outlet connection, 49;. The upper end of compartment 59; connects with thefiue 55 while the lower end; of this compartment: is in commnnicationwith a flared, inlet duct 63.whi ch.is.positioned'a with its inlet opening covering a portion of the, grille 14.. 'ljhe, operation of the vent diverter in heaters ofithis type is. Well: known, and in general; the. diverter prevents; varia.-. tions in draft conditions in, the flue from being reflected; into thecombustion chamber where it could influencethe operation of, the burner. Vent diverters are a conven-r tionalsafety feature which has been incorporated into the heater f he. pre en inventi n.

, From,the foregoing. description, it will be apparent that the, wall: heater; embodying the, features. of the present: invention operates in a different manner than conventional: heatersof this type in. that it takes air from or adjacent to the ceiling and, after passing it through a heating chamber, dischargesrthe heatedyair at or near floor level where it replaces cold air and provides warmth where needed. By circulating the heated air in this manner, the usual efiects, of stratificationam avoided and a more healthful qqh'd tiqn provided.

Variousmodifi'cations may suggest themselves to those skilled inthe artzwithout departing from the spirit otmy invention, and, hence, I; donotwish to be restricted to the specific form, shown or uses. mentioned, except tothe iilQntindicatedin the appended claims.

I laim:

1. Aspaceheater, comprising: anupright casing-having side, walls; partition. means separating said easing into uppenanddower compartments, the upper-compartment having. anyain inlet. at its upper end and an air outlet at itslower end, andthe lower compartment having an air inlet; meansincluding side walls and a top wall having an opening therein providing a heating chamber in the upper compartment of said casing, said top wall being disposed helowthe upper end of said casing to provide a space above said heating chamber, said chamber having its lowermostend-in communication with said air outlet, and said casing. and said heating chamber having their side- WhllSspaced-so. astoform a passage aroundsaid heating chamber communicating at its upperendwith the space above saidtop wall, the lower ends ofthe side walls of. said heating chamber cooperating with said; partition meansto-form acommunication of'said passage with said lower compartment for upward flow of air therefrom;

means providing a combustion chamber in said heating chamber connected to receive combustion air from said lower compartment; a burner in said combustion chamber; vent means communicating with said combustion chamber; and air moving means in the space above said top wall in said upper compartment having an inlet positioned to receive air from the air inlet in the upper end of said upper compartment, sai'dair moving means having an outlet directed toward and spaced from the opening in said top wall for discharging an air stream into the opening for flow through the heating chamber and dis charge through, said outlet; into, space, to bev heated thereby whereby additional flow of air is induced through said opening into the air stream from the lower compartment and through the space between the side walls of the heating chamber and casing to cool the same. i

2. A space heater, comprising: an upright casing having side walls; partition means separating said casing into upper and lower compartments, the upper compartment having an air inlet at its upper end andanair outlet at its lower end, and the lower compartment having an air inlet; means including side walls and. a top wall having an opening therein providing, aheating chamber in the upper compartment of said casing, said top wall being disposed below the upper end of said. casing to provide a space above said heating chamber, said: chamber having its lowermost end in communication with said air outlet, and said, casing and said heating chamber having their side walls spaced so asto form a passage around said heat ing chamber communicating at its upper end with the spacezabove saidtop wall, the;lower-ends of the side walls of: said heating chamber cooperating with said partition meanstoform a communication of said passage with said lower compartment for upward flow of, air therefrom; an upright combustion chamber in said heating chamber connected toreceive combustion air from said lower compartment and having an. outlet in its upper portion for hot gasesof combustion; a burner positionedwithin the lower portion; of, said combustion chamber; a radiator adjacent.

said combustion chamber extending generally downwardly from the upper end of the combustion chamber and being connected at its upper portion with the combustion chamber outlet; deflector means positioned in said heating chamber above said. combustion chamber and radiator to distribute air fiowingdownwardly through said heating chamber; vent: means connected at the upper end of said radiator; and air movingmeans in the space above said topwall in sai-d upper compartment having an inlet positioned to ;roc eive= airfrom the air inletin the upper end ofgsaid upper compartment, said air moving means having an outlet directed toward, and; spaced from the opening inisaid top wallior dischargingan air stream intothc opening or-flow, throngh the heating chamber and dis-r charge; through; said air outlet into a space to be heated thereby-whereby additional flowofi air is induced through said openinginto theair streamfrom the lower compartmentand through the. spacebetweenthe side walls of the heating chamber and casing to cool the same.

References Citedin the file of this patent UNITED STATES- PATENTS 1;Q7*4,l94 Pascoe Sept. 30, 1913 1,637,014 Thompson July 26, 1927 1,991,704, Schellhammer Feb. 19, 1935 2,068,111 Resek et al Jan. 19, 1937 2,089,969 Kuenhold Aug. 17, 1937 2; 157;'109 Bell May 9, 1939 2593;759 Horn, Apr, 22, 1952 23522806 Simmons et al, Dec. 23, 1952 2,6,25150 Little Jan. 13, 1953 

